from datetime import datetime, timedelta
from typing import Union

from passlib.context import CryptContext
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from jose import JWTError, jwt

from .config import settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

def verify_password(plain_password: str, hashed_password: str):
    """
    验证 明文密码 vs hash密码
    """
    return pwd_context.verify(plain_password, hashed_password)

def get_password_hash(password: str):
    """
    加密明文
    """
    return pwd_context.hash(password)

def create_access_token(data: dict, expires_delta: Union[timedelta, None] = None):
    """
    生成token
    # data 字典
    # expires_delta 有效时间
    """
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        # 默认15分钟有效时间
        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
    return encoded_jwt

